package edu.mju.eduuser.controller;

import com.google.gson.Gson;
import edu.mju.commonutils.JwtUtils;
import edu.mju.eduuser.entity.StudyMember;
import edu.mju.eduuser.service.StudyMemberService;
import edu.mju.eduuser.utils.ConstantWxUtils;
import edu.mju.eduuser.utils.HttpClientUtils;
import edu.mju.servicebase.exception.StuException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @Author: wyp
 * @Date: 2020/9/28 16:05
 * RestController返回数据
 */
@CrossOrigin
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private StudyMemberService studyMemberService;

    /**
     * 获取扫描人的方法
     * @param code
     * @param state
     * @return
     */
    @GetMapping("/callback")
    public String callback(String code , String state){
        try {
            //获取code值，临时票据，类似于验证码
            //拿code请求微信固定的地址，得到accsess_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数 ：id  秘钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );

            //请求这个拼接好的地址，得到返回两个值 accsess_token 和 openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值 accsess_token 和 openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);

            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");

            //把扫描人信息添加数据库里面
            //判断数据表里面是否存在相同微信信息，根据openid判断
            StudyMember member = studyMemberService.getOpenIdMember(openid);
            //memeber是空，表没有相同微信数据，进行添加
            if(member == null) {

                //3 拿着得到accsess_token 和 openid，再去请求微信提供固定的地址，获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userinfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                //昵称
                String nickname = (String)userInfoMap.get("nickname");
                //头像
                String headimgurl = (String)userInfoMap.get("headimgurl");

                member = new StudyMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                studyMemberService.save(member);
            }

            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
            e.printStackTrace();
            throw new StuException(20001,"微信登陆失败");
        }


    }

    /**
     * 生成微信扫描二维码
     * @return 路径
     */
    @GetMapping("/login")
    public String getWxCode(){
        //固定地址+参数
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch(Exception e) {
            e.printStackTrace();
        }

        //向baseUrl设置值
        String mju = String.format(baseUrl, ConstantWxUtils.WX_OPEN_APP_ID, redirectUrl, "mju");

        //重定向到请求微信地址中
        return "redirect:"+mju;
    }
}
